title: Short range magnetic correlations induced by La substitution in Ho(1-x)La(x)Mn(2)O(5).
abstract: Magnetic susceptibility, x-ray diffraction, neutron diffraction and Raman scattering measurements are employed to study the effects of La substitution on the magnetic properties of multiferroic HoMn(2)O(5). 9% and 18% La-substituted compounds crystallize into the same orthorhombic Pbam symmetry as the parent compound. The magnetic responses to an ac driving magnetic field between 40 and 140 K are greatly enhanced by 18% La substitution. The neutron magnetic diffraction patterns reveal the development of short range magnetic correlations below 140 K. In addition, two Raman peaks and a series of new x-ray diffraction peaks suddenly develop below this temperature. Incommensurate long range antiferromagnetic order appears below 38 K. Magnetic frustration could be the main mechanism governing the present observations.
authors.affiliation: Department of Physics and Center for Neutron Beam Applications, National Central University, Jhongli, 32001, Taiwan.
authors.forename: Chin-Wei
authors.initials: CW
authors.lastname: Wang
authors.forename: Chun-Ming
authors.initials: CM
authors.lastname: Wu
authors.forename: Chi-Yen
authors.initials: CY
authors.lastname: Li
authors.forename: Sunil K
authors.initials: SK
authors.lastname: Karna
authors.forename: Chien-Kang
authors.initials: CK
authors.lastname: Hsu
authors.forename: Carissa H C
authors.initials: CH
authors.lastname: Li
authors.forename: Wen-Hsien
authors.initials: WH
authors.lastname: Li
authors.forename: Chun-Chen
authors.initials: CC
authors.lastname: Yu
authors.forename: Chun-Pin
authors.initials: CP
authors.lastname: Wu
authors.forename: Hsiung
authors.initials: H
authors.lastname: Chou
authors.forename: Jeffrey W
authors.initials: JW
authors.lastname: Lynn